My XDA II crashed, and after re-booting it went back to the factory set-up menus. When I attach the device to my computer it wants to establish a new partnership and I can't use the 'existing' "Pocket_PC" partnership. If I set-up a new partnership and try to restore from my .stg file, it gives me an error warning saying the device was backed-up using a different device (even though I had just backed it up a day earlier using the same XDA II device ... it is NOT a different device!)

How can I restore my XDA II to the settings, Calendar, Contacts, etc. from the .stg file I have on my system? Please help! Thanks!

This seems to happen on the XDA II on a hard reset: it changes your country/language settings to default (might be UK English). Go to Regional settings and put the device back they way you had it before the crash. Then try the restore.